arizona and the obama administration. this time, over the state requirement that those who seek to register to vote provide proof of u.s. citizenship. arizona registration form requires more proof than the simpler federal form. on which applicants check a box, ind kateing u.s. citizen think, sign attesting to that fact and drop it in the mail. arizona argues that it doesn't conflict with the federal form but serves as an additional barrier against voting by non-u.s. citizens. >> if somebody is willing to fraudulently vote that person would be willing to sign fals falsely. so the signature doesn't mean anything. we need evidence that the person is a citizen. >> justice scalia sounded skeptical of the streamlined federal form. "check off, i am a citizen, right? so it's under oath. big deal. if you are willing to violate the voting laws i suppose you're willing to violate the perjury laws." despite issue the arizona officials say they are facing justices like ruth bader ginsberg said there are statutes saying they must accept and use the federal form period. that is the end of it.